your 6'3 the 179 is gonna be small for you...depending on HOW you ski will determine how well it will work
if your a laid back park skier who does not "push it" while skiing a 179 should be fine...
if you ski at mach 3 and rally high spped runs and attack the park and the mountain like 6'3 tall monster, the 179 is grossely undersized...
I ski the 179 pe - I am 5'11 and they are times way to small, but do ok most of the time - I normally ski a 189 on pow days and a 188 all mountain ski